Field diode laser spectrometer employing an astigmatic Herriott cell

Scott David Sewell; Alan Fried; Bruce E. Henry; James R. Drummond

doi:10.1117/12.177287

3 June 1994 Field diode laser spectrometer employing an astigmatic Herriott cell

Scott David Sewell, Alan Fried, Bruce E. Henry, James R. Drummond

Proceedings Volume 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements; (1994) https://doi.org/10.1117/12.177287
Event: SPIE's International Symposium on Optical Sensing for Environmental Monitoring, 1993, Atlanta, GA, United States

Abstract

In this paper, we describe a new field diode laser system which incorporates a commercially-available astigmatic Herriott cell. This cell achieves a path length of 100 m while retaining a relative small sampling volume (approximately 3 l). This combination allows both high sensitivity and low cell residence times to be achieved. The optical system for effectively coupling the diode laser radiation into such a cell is briefly discussed. Line fitting procedures are also discussed for fitting second harmonic spectra in the presence of sloping and/or curved baseline structure. An initial application using the filed system for detection of formaldehyde is also described. Initial estimates place the instrumental detection sensitivity at approximately 50 pptv for formaldehyde using a 1Hz sampling bandwidth. This corresponds to a minimum detectable absorbance of about 2X10^-6.

Citation Download Citation

Scott David Sewell, Alan Fried, Bruce E. Henry, and James R. Drummond "Field diode laser spectrometer employing an astigmatic Herriott cell", Proc. SPIE 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements, (3 June 1994); https://doi.org/10.1117/12.177287

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